Material Analysis
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TPE sticky surface exudation
Problem Phenomenon
The TPE product surface is sticky, becomes sticky again soon after wiping, and has a poor hand feel
Cause Analysis
Main causes of TPE stickiness: excessive molding temperature causes thermal decomposition producing low-molecular substances; excessive filling oil migration; improper selection of stabilizers and softeners; shear heat causing temporary high temperature
Solution
①reduce molding temperature and shear; ②purge the barrel with nitrogen; ③optimize the stabilizer and softener formulation; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE stickiness is a dual signal of formulation and process; troubleshoot along the three lines of temperature, shear, and formulation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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